Motorcycle

ABSTRACT

A motorcycle has a fuel tank disposed near the front end of a motor cycle body frame and positioned substantially upwardly of the body frame, a rider&#39;s seat disposed rearwardly of the fuel tank, and an engine disposed downwardly of the body frame. A receptacle for storing a crash helmet, for example, is disposed rearwardly of the fuel tank, forwardly of the rider&#39;s seat, and upwardly of the engine. The receptacle is openable and closable by at least a portion of the rider&#39;s seat which is movable back and forth or pivotally movable about an end thereof.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a motorcycle, and more particularly toa motorcycle having a helmet storage box in its body.

2. Description of the Relevant Art

Japanese Laid-Open Utility Model Publication No. 59-192481 discloses amotorcycle having a large-size storage box or receptacle disposed in themotorcycle body. The motorcycle has an engine supported beneath a bodyframe extending rearwardly from a head pipe, and a fuel tank disposedbelow a rider's seat. The storage box is positioned above the body frameis suitable for storing a helmet, and has an upper opening and a coverfor the opening.

In the disclosed motorcycle, the upper space above the body frame,except for a dead space near the head pipe, is occupied by the storagebox, and hence space availability above the body frame is limited. Inaddition, the layout of the engine and accessories is limited in orderto avoid physical interference with the storage box.

SUMMARY OF THE INVENTION

According to the present invention, there is provided a motorcycleincluding a longitudinally extending body frame supporting front andrear wheels on front and rear ends, respectively, thereof, a fuel tankdisposed near the front end of the body frame and positionedsubstantially upwardly of the body frame, a rider's seat disposedrearwardly of the fuel tank, an engine disposed downwardly of the bodyframe, and a receptacle disposed rearwardly of the fuel tank, forwardlyof the rider's seat, and upwardly of the engine, the receptacle beingopenable and closable by at least a portion of the rider's seat.

The receptacle according to the present invention, which is of a largesize, is mounted on the motorcycle by effectively and efficientlyutilizing space available on the motorcycle, and so that the engine, thefuel tank, an air intake device or air cleaner, and the rider's seat canbe arranged or laid out with increased freedom.

Since the receptacle can be opened and closed by moving the rider'sseat, the appearance of the motorcycle is improved.

The above and further objects, details and advantages of the presentinvention will become apparent from the following detailed descriptionof preferred embodiments thereof, when read in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side elevational view of a motorcycle according toa first embodiment of the present invention;

FIG. 2 is a schematic side elevational view, partly in cross section ofa portion of the motorcycle shown in FIG. 1;

FIG. 3 is an exploded perspective view of a body frame and a helmetstorage box or receptacle;

FIG. 4 is a side elevational view of the body frame;

FIG. 5 is a cross-sectional view taken along line 5 --5 and line 5'--5'of FIG. 4;

FIG. 6 is a side elevational view of a body frame according to amodification of the first embodiment;

FIG. 7 is an exploded perspective view of the body frame of FIG. 6 and ahelmet receptacle;

FIG. 8 is a cross-sectional view taken along line 8 --8 and line 8'--8'of FIG. 6;

FIGS. 9 (a) and 9 (b) are enlarged fragmentary cross-sectional views ofmodifications of a portion encircled at 9 in FIG. 8;

FIG. 10 is a schematic side elevational view, partly in cross section,of a motorcycle according to a second embodiment of the presentinvention;

FIG. 11 is a side elevational view of a fuel tank;

FIG. 12 is an exploded perspective view of a helmet receptacle;

FIG. 13 is a plan view of the helmet receptacle;

FIG. 14 is a cross-sectional view taken along line 14--14 of FIG. 10;

FIG. 15 is a cross-sectional view taken along line 15--15 of FIG. 10;

FIG. 16 is a cross-sectional view taken along line 16--16 of FIG. 10;

FIG. 17 is a schematic side elevational view, partly in cross section,of a portion of a motorcycle according to a third embodiment of thepresent invention;

FIG. 18 is a schematic side elevational view, partly in cross section,of a motorcycle according to a fourth embodiment of the presentinvention;

FIG. 19 is a cross-sectional view taken along line 19--19 of FIG. 18;

FIG. 20 is a fragmentary cross-sectional view showing a seat pipe and aroller rotatably supported by a seat and rollingly riding on the seatpipe;

FIG. 21 is a fragmentary side elevational view as viewed in thedirection of the arrow 21 in FIG. 20;

FIG. 22 is a fragmentary cross-sectional view showing the seat pipe andan L-shaped member mounted on the seat; and

FIG. 23 is a schematic side elevational view, partly in cross section,of a motorcycle according to a fifth embodiment of the presentinvention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in FIG. 1, a motorcycle has a body frame 1 comprising a headpipe 2, a pair of main pipes 3 of rectangular cross section extendingrearwardly from the head pipe 2, and a pair of central pipes 4 extendingdownwardly from the rear ends of the main pipes 3. The head pipe 2 isfixed to the front ends of the main pipes 3. A front wheel 21 isrotatably supported by a front fork 22 on its lower end, which issteerably supported on the head pipe 2 by upper and lower bridges 23, 24and a steering stem (not shown). A handlebar 25 is mounted on the upperend of the front fork 22. A rear swing arm 27 on which a rear wheel 26is rotatably mounted is swingably supported between the central pipes 4.

An engine 11 has a forwardly inclined cylinder 14 mounted on a frontportion of a crankcase 12 including a transmission case 13 in its rearportion. The engine 11 is suspended from the main pipes 3 and thecentral pipes 4. A drive transmission mechanism 28 which comprises achain-and-sprocket mechanism in the illustrated embodiment isoperatively coupled between one side of the transmission case 13 and therear wheel 26. A carburetor 15 is connected to an upper portion of thecylinder 14 and has an upper end coupled to an air cleaner 16 (FIG. 2)disposed in a central recess 18b defined in the bottom wall 18a of afuel tank 18 located above the front portions of the main pipes 3. Arider's seat 31 which is angularly movable about a pivot shaft 35between lifted and lowered positions is disposed rearwardly of the fueltank 18. A rear cowl 38 is located beneath a rear portion of the rider'sseat 31.

A large-size receptacle 40 comprising a crash helmet storage box isdisposed above the transmission case 13 of the engine 11, rearwardly anddownwardly of the fuel tank 18, and forwardly and downwardly of therider's seat 31. An upper opening of the helmet storage box 40 iscovered by the seat 31, and can be opened and closed by lifting andlowering the seat 31.

As illustrated in FIG. 3, the body frame 1 is constructed as a pipingframe in its entirety including a cross pipe 5 extending transverselybetween the central pipes 4, a pair of seat pipes 6 fixed to andextending rearwardly from the main pipes 3, a pair of subpipes 7 joinedbetween upper portions of the central pipes 4 and rear portions of theseat pipes 6, and a plurality of cross plates 8 extending transverselybetween front, central, and rear portions of the seat pipes 6. A pair ofseat support members 9 is vertically mounted on the front cross plate 8.

As will be understood from FIGS. 1 and 3, the body frame 1 extendslongitudinally of the motorcycle in a straight manner.

The rider's seat 31 comprises a cushioning member 34 interposed betweena bottom plate 32 and a covering 33, as shown in FIG. 2. The front endof the bottom plate 32 is coupled to the seat support members 9 by thepivot shaft 35. Thus, the seat 31 is pivotally supported at its frontend on the body frame 1.

The seat bottom plate 32 includes a front portion serving as the coverof the receptacle or helmet storage box 40. As can be understood fromFIGS. 2 and 3, the helmet storage box 40 comprises a pair oftransversely spaced side covers 41, a rear member 51, and a front member61. All of these components of the helmet storage box 40 are preferablymade of synthetic resin.

As shown in FIGS. 1-3, each of the side covers 41 has an upper edge 42extending adjacent to a rear wall 18c of the fuel tank 18 and the bottomplate 32 of the seat 31, a lower edge 43 facing the lower surface of oneof the subpipes 7, a front edge 44 extending adjacent to an upper rearsurface of one of the main pipes 3 and an upper rear surface of one ofthe central pipes 4, and a rear edge 45 extending adjacent to a frontportion of the rear cowl 38. As shown in FIG. 5, the upper edges 42 ofthe side covers 41 are bent inwardly of downwardly extending sideportions 36 of the seat 31 above the respective seat pipes 6. The loweredges 43 of the side covers 41 cover the lower surfaces of the subpipes7. In FIGS. 2 and 3, the rear member 51 of the helmet storage box 40comprises a lower panel 52 and a rear panel 55 extending upwardly fromthe rear edge of the lower panel 52. The lower panel 52 has a pair ofdownwardly opening grooves 53 defined along its lateral side edges,respectively, and a joint member 54 on its front edge. The lower panel51 is mounted on the subpipes 7 which are fitted respectively in thegrooves 53. An inwardly convex rear fender 56 is formed continuously onthe lower and rear panels 52, 55. A seal member 37 is interposed betweenthe rear panel 55 and the seat bottom plate 32.

The front member 61 includes a lower panel 62 and a rearwardly inclinedfront panel 66 extending from the front edge of the lower panel 62. Ajoint member 63 extends from the rear edge of the lower panel 62. Sidepanels 64 extending upwardly from the side edges of the lower panel 62have respective outwardly extending flanges 65 for engaging the upperrear surface of the main pipes 3, respectively. An engaging member 67 ismounted upwardly on an intermediate portion of the outer surface of thefront panel 66. An upper member 68 is mounted upwardly on the upper edgeof the front panel 66 for abutting against the front cross plate 8. Abattery storage space 70 and an accessory storage space 80 are definedbetween a front portion of the lower panel 62 and a lower portion of thefront panel 66.

The joint member 63 on the rear edge of the lower panel 62 of the frontbox member 61 is placed on and fastened by screws to the joint member 54on the front edge of the lower panel 52 of the rear box member 51. Thelower panel 62 is supported on the main pipes 3 by the flanges 65. Theengaging member 67 on the front panel 66 of the front box member 61engages in a recess 17 defined in a rear portion of the bottom wall ofthe air cleaner 16, as shown in FIG. 2.

The helmet storage box 40 has its front portion positioned upwardly ofthe transmission case 13, rearwardly and downwardly of the fuel tank 18,and forwardly and downwardly of the seat 31. The helmet storage box 40has an upper rear opening 49 below a lower front surface of the seatbottom plate 32 when the seat 31 is in the lowered position.

As shown in FIG. 2, the opening 49 of the helmet storage box 40 can beopened and closed by the seat 31 to store and remove a full-face crashhelmet H, for example, into and out of the helmet storage box 40. Thehelmet H has its upper front surface inclined rearwardly, and faces inthe forward direction when stored in the helmet storage box 40. Thefront panel 66 of the front member 61 of the helmet storage box 40 isalso inclined rearwardly substantially along the rearwardly and upwardlyinclined rear wall 18c of the fuel tank 18 in complementary relation tothe rearwardly inclined upper front surface of the helmet H.

The helmet storage box 40 also stores a battery B in the battery storagespace 70 and an accessory or accessories in the accessory storage space80.

FIGS. 6 through 8 illustrate a motorcycle according to a modification ofthe first embodiment of the present invention. The motorcycle has amonocoque body frame 1' including a pair of side covers 41' of metalhaving respective front edges 44' joined to upper rear surfaces of mainpipes 3' and upper rear surfaces of central pipes 4', respective loweredges 43' fixedly joined to joint members 53', respectively, on the sideedges of a lower panel 52' of a rear box member 51' of metal, andrespective rear edges 45' fixedly joined at their inner surfaces to theside edges of a rear panel 55' of the rear box member 51'. A cross plate8' is joined laterally between intermediate portions of upper edges 42'of the side covers 41, with a pair of laterally spaced pivot shaftsupport members 9' mounted on the cross plate 8'. The rear panel 55' ofthe rear box member 51' has an upper edge serving as a cross plate 58'.Rear seat rails 47' and rear subrails 48' have front ends fixed toattachment members 46' mounted on the respective rear edges 45' of theside covers 41'.

A front box member 61' made of synthetic resin includes a lower panel62' having a joint member 63' on its rear edge, which is placed on andscrewed to a joint member 54' on the front edge of the lower panel 52'of the rear box member 51'. An engaging member 67' on an intermediateportion of the outer surface of a front panel 66' of the front boxmember 61' will engage in a recess defined in a rear portion of thebottom wall of an air cleaner in the same manner as the unmodifiedversion of this embodiment, which is shown in FIG. 2.

The side covers 41' and the rear box member 51' which are of metal andintegral with the body frame 1', and the front box member 61' ofsynthetic resin jointly constitute a helmet storage box 40'. The helmetstorage box 40' has a front portion disposed upwardly of a transmissioncase of an engine, rearwardly and downwardly of a fuel tank, andforwardly and downwardly of a rider's seat 31' in the same manner as theunmodified version of this embodiment, which is shown in FIGS. 1-3.Referring to FIG. 8, the helmet storage box 40' has an upper rearopening 49' below a lower front surface of a seat bottom plate 32'.

An upper edge 42" of a side cover 41" which is disposed inwardly of adownwardly extending portion 36' of a side of the seat 31' may be in theform of an outwardly opening channel as shown in FIG. 9(a).Alternatively, an elastomeric seal member 39' may be interposed betweenan upper edge 42"' of a side cover 41"' and the seat bottom plate 32' asshown in FIG. 9(b). With these arrangements, rain water or the like isprevented from entering the box opening 49'.

FIGS. 10 through 16 show a motorcycle according to a second embodimentof the present invention. As shown in FIGS. 10 and 11, a fuel tank 112has a recess 113 defined centrally in a rear surface thereof in thetransverse direction and extending forwardly, and a pair of arms 112aextending rearwardly and downwardly, one on opposite sides of the recess113. The arms 112a are attached respectively to a pair of laterallyspaced seat pipes 104 by attachment members 114. The fuel tank 112 has apair of semicircular engaging members 115 mounted on the opposite lowersides of a front end portion thereof. The fuel tank 112 is mounted on apair of laterally spaced main pipes 103 by the engaging members 115which engage respective cylindrical shafts 116 projecting from the mainpipes 103, respectively.

As shown in FIGS. 14 and 15, a rider's seat 117 includes a rigid bottomplate 118 in the form of a tray opening downwardly, a cushioning member119 mounted on the bottom plate 118, and a covering 120 placed over thecushioning member 119. As shown in FIG. 14, a pair of attachment members121 is disposed on a lower surface of the rear end of the seat bottomplate 118 and pivotally mounted on a cross member 122 extending betweena pair of laterally spaced seat pipes 104 by means of pins 111. The seat117 is, therefore, vertically angularly movably supported at its rearend on the seat pipes 104. Outer sides of a motorcycle body frame belowthe opposite sides of the seat 117 are covered by respective covers 123having front edges extending adjacent to the rear edges of the arms 112aof the fuel tank 112.

The body frame, designated by 101, has a cavity or space 101a (FIG. 12)defined downwardly between the seat 117 and the fuel tank 112 by themain pipes 103 which are inclined rearwardly and downwardly and the seatpipes 104 which are inclined rearwardly and upwardly. The lateralopenings of the space 101a are covered by the arms 112a of the fuel tank112 and the covers 123. A helmet storage box 124 is disposed in thespace 101a. As illustrated in FIGS. 12 and 15, the helmet storage box124 is fixedly mounted on and lies between the main pipes 103, and hasan upper opening 124a which is closed by the bottom plate 118 of theseat 117 and a cover 125 integral with and extending forwardly from thebottom plate 118 when the seat 117 is in its normal position, i.e., thelowered position. The opening 124a of the helmet storage box 124 canthus be opened by angularly moving the seat 117 upwardly about the pins111 on the rear end thereof for allowing free storage or removal of ahelmet 126 or other large items. The cover 125 has an engaging member127 extending along the front edge thereof. By bringing the engagingmember 127 into a groove 128 defined in the rear edge of the fuel tank112, the cover 125 is engaged by the fuel tank 112, and the upperopening of the helmet storage box 124 is closed by the cover 125 incooperation with the fuel tank 112 and the seat 117. Pairs of partitionattachment members 129 are mounted on inner surfaces of the oppositeside walls and bottom wall of the helmet storage box 124. With apartition 130 inserted between the pairs of partition attachment members129, there is defined a storage space 131 in a rear portion of thehelmet storage box 124 for storing another article or articles than thehelmet 126.

An air cleaner case 132 is integrally formed with a front portion of thehelmet storage box 124 and positioned in the recess 113 of the fuel tank112. The air cleaner case 132 comprises a pair of opposite side walls132a integrally contiguous to respective side walls 124b of the helmetstorage box 124, and a bottom wall 132b and a front wall 132c which areintegrally contiguous to a front wall 124c of the helmet storage box124. The helmet storage box 124 and the air cleaner case 132 are moldedas a unitary body of synthetic resin. The air cleaner case 132cooperates with a separate partition 133 in forming a single closedcontainer, the partition 133 being detachably mounted on the air cleanercase 132 to hermetically close upper and rear openings of the aircleaner case 132. The interior space of the air cleaner case 132 isdivided into a front chamber 135a and a rear chamber 135b by a cleanerelement 134. The front chamber 135a has an air inlet port 136, and therear chamber 135b is held in communication with an inlet port of anengine 110 through a carburetor 137. Air introduced from the air inletport 136 into the front chamber 135a is purified by the air cleanerelement 134, and then drawn from the rear chamber 135b via thecarburetor 137 into the engine 110.

The partition 133 has a positioning bulge 139 for projecting into anopening 126a of the helmet 126 when the helmet 126 is stored in thehelmet storage box 124 with the opening 126a being directed forwardly,to thereby position the helmet 126 against wobbling movement.

Since the helmet storage box 124 and the air cleaner case 132 areintegrally formed as a unitary construction, the number of parts used issmaller, the number of manufacturing steps required is smaller, and theoverall size is smaller, than would be if the helmet storage box and theair cleaner case were separately formed. The helmet storage box 124 andthe air cleaner can be disposed in a compact fashion in the spacebetween the seat 117 and the fuel tank 112, thus allowing an excessivespace to be available for installing other parts and accessories thereinwith greater freedom.

The helmet 126 and other articles can be easily stored into and removedfrom the helmet storage box 124 by lifting the seat 117 about its rearend to open the upper opening of the helmet storage box 124. After thehelmet or other articles have been stored, the upper opening of thehelmet storage box 124 is fully covered by the seat 117 and the cover125, and the helmet 126 is stably stored. By lifting the seat 117 andremoving the helmet 126, the partition 133 can be easily taken from theair cleaner case 132 into the helmet storage box 124 for permitting easyinspection of the air cleaner in the air cleaner case 132.

FIG. 17 shows a third embodiment of the present invention. A fuel tankhousing 210 is supported on main pipes 203. The fuel tank housing 210has a front inner space serving as a fuel tank 217 and a rear innerspace serving as a storage box 219 for storing a helmet 218, the storagebox 219 being divided from the fuel tank 217 by a fuel tank rear wall217a.

A rider's seat 240 comprises a front portion 241 and a rear portion 243which are separate from each other. The front seat portion 241 has abottom plate 242 having an extension 242a extending forwardly andlaterally of the front seat portion 241. The extension 242a cooperateswith the fuel tank housing 210 in defining the storage box 219. Thebottom plate 242 is angularly movably supported at its front end on thefuel tank housing 217 by means of a hinge 244. The bottom plate 242 thusserves as a cover for opening and closing the storage box 219. The rearseat portion 243 has a bottom plate 245 fixed to seat pipes 204. In thisembodiment, an air cleaner case 213 and a carburetor 214 are disposedbetween a transmission case 216 of an engine 215 and the storage box 219located directly above the transmission case 216.

FIGS. 18 through 22 illustrates a fourth embodiment of the presentinvention. A large-size storage box 310 is positioned rearwardly anddownwardly of a fuel tank 305 and forwardly and downwardly of a rider'sseat 313, and fixed to main pipes 303 and subpipes 309. The fuel tank305, an air cleaner 306, a carburetor 307, and other components arecovered with a body cover 311. The body cover 311 has an opening 312 forgaining access into a storage chamber 310a in the storage box 310, theopening 312 extending from the rear end of the fuel tank 305 to the rearend of the cover 311.

A rider's seat 313 doubles as a cover for opening and closing theopening 312. The seat 313 comprises a bottom plate 313a, a cushioningmember 320 mounted on the bottom plate 313a, and front and rearextensions 313b, 313c integral with the bottom plate 313a and extendingforwardly and rearwardly of the cushioning member 320. The extensions313b, 313c have surfaces lying flush with the surfaces of the cover 311.When the opening 312 is closed by the seat 313, the extensions 313b,313c look as part of the cover 311. As shown in FIGS. 20 and 21, twofront and rear pairs of rollers 314 are rotatably mounted on the bottomplate 313a and bearing plates 315 near the lower ends of the oppositesides of the seat 313. The seat 313 is movably mounted on seat pipes 308by the rollers 314. L-shaped members 316 are attached to the bottomplate 313a at suitable locations in surrounding relation to the seatpipes 308 for preventing the seat 313 from being derailed from the seatpipes 308. The bottom plate rear extension 313c has a cylinder lock 317embedded therein for locking the seat 313 to the seat pipes 308 when theseat 313 is in a position to close the opening 312 of the cover 311.

The seat 313 includes a front rising portion 313e having a lower surfaceto which a shallow small-size storage box 318 is pivotally attached by ahinge 318a. The storage box 318 is detachably coupled to the lowersurface of the seat 313 by an engaging member 318b, the storage box 318serving to store small articles such as gloves, tools, or the like. Thestorage box 318 has an outer surface covered with a layer of sponge orprotective padding 318c.

When the lock 317 is unlocked and the seat 313 is moved back on the seatpipes 308 to open the opening 312, the large-size storage box 310 isopened for allowing a helmet 350 to be stored or removed while thehelmet 350 being turned upside down with its opening 350a up. As shownin FIG. 19, when the opening 312 is closed by the seat 313, thesmall-size storage box 318 enters the helmet 350, thus effectivelyutilizing the space in the helmet 350. According to alternatives, thesmall-size storage box 318 may be replaced with a forwardly opening box,and the seat bottom may be directly placed on the seat pipes for slidingmovement thereon without employing the rollers 314.

A motorcycle 420 according to a fifth embodiment of the presentinvention is shown in FIG. 23. The motorcycle 420 has a large-sizestorage box 429 for storing a helmet 450 disposed rearwardly of a fueltank 424 and forwardly of a rider's seat 431, the storage box 429 havingan opening 429a opening rearwardly and upwardly. The seat 431 isoperatively coupled to seat pipes 427 by two sets of links 430. The seat431 comprises a bottom plate 431a, a cushioning member 434 mounted onthe bottom plate 431a, and an extension 431b integral with the bottomplate 431a and extending forwardly of the cushioning member 434. Theextension 431b has an opening 433 which can be opened and closed by asmall cover 432 on which a cushion 435 is mounted.

The links 430 are coupled to the seat bottom plate 431a and the seatpipes 427 at such positions that when the seat 431 is moved forwardly toclose the opening 429a of the storage box 429, as shown, the links 430are inclined forwardly. When the seat 431 is pulled rearwardly whilebeing slightly elevated, the links 430 are turned back and rearwardlyinclined about points 427a where the links 430 are pivoted to the seatpipes 427. At this time, the seat 431 is moved backward to open theopening 429a of the storage box 429. The helmet 450 can be stored intothe storage box 429 while it is turned upside down, or while its opening450a is being directed forwardly with a movable windshield or visor 450bdirected up. With the helmet 450 thus stored, small articles can betaken into and out of the helmet 450 by opening the small cover 432. Thecushion 435 of the small cover 432 as it is closed is substantiallycontiguous to the cushioning member 434 of the seat 431.

In the fourth and fifth embodiments, suitable stoppers are positionedfor limiting forward movement of the seats 313, 431, so that the forcesapplied by the weight of the rider on the seat to move the seatforwardly can be restrained by these stoppers. Grips for moving theseats are mounted on suitable positions on the seats such as sideportions or front portions thereof. In these embodiments, the large-sizestorage box or chamber can fully be opened and closed simply by movingthe seat back and forth. Since the seat is vertically moved only a smallstroke, the manual effort needed to move the seat may be small, andhence the seat can be handled with ease.

Although there have been described what are at present considered to bethe preferred embodiments of the present invention, it will beunderstood that the invention may be embodied in other specific formswithout departing from the spirit or essential characteristics thereof.The present embodiments are therefore to be considered in all aspects asillustrative, and not restrictive. The scope of the invention isindicated by the appended claims rather than by the foregoingdescription.

We claim:
 1. A motorcycle comprising:a body frame extending in astraight manner substantially along a longitudinal axis of themotorcycle and supporting front and rear wheels on front and rear ends,respectively, thereof: a fuel tank disposed near said front end of thebody frame and positioned substantially upwardly of said body frame; arider's seat disposed rearwardly of said fuel tank; an engine disposeddownwardly of said body frame; a receptacle adapted to selectively storelarge sized articles therein and disposed at least partially rearwardlyof said fuel tank, at least partially forwardly of said rider's seat,and at least partially upwardly of said engine; said receptacle havingan opening defined therein and comprising a storage box for storing acrash helmet therein; said seat being movably supported on saidmotorcycle for selectively convering said opening; and means for movingsaid rider's seat substantially longitudinally along said body frame forselectively covering said opening.
 2. A motorcycle according to claim 1,wherein said rider's seat is movable along a forwardly and downwardlyinclined surface of said body frame.
 3. A motorcycle comprising:a bodyframe extending in a straight manner substantially along a longitudinalaxis of the motorcycle and supporting front and rear wheels on front andrear ends, respectively, thereof; a fuel tank disposed near said frontend of the body frame and positioned substantially upwardly of said bodyframe; a rider's seat disposed rearwardly of said fuel tank; an enginedisposed downwardly of said body frame; a receptacle adapted toselectively store large sized articles therein and disposed at leastpartially rearwardly of said fuel tank, at least partially forwardly ofsaid rider's seat, and at least partially upwardly of said engine; saidreceptacle having an opening defined therein and comprising a storagebox for storing a crash helmet therein; said seat being movablysupported on said motorcycle for selectively covering said opening; andsaid fuel tank having a rearwardly and upwardly inclined rear wall, saidreceptacle having a front wall inclined rearwardly and upwardly alongsaid rear wall of said fuel tank.
 4. A motorcycle comprising:a bodyframe extending in a straight manner substantially along a longitudinalaxis of the motorcycle and supporting front and rear wheels on front andrear ends, respectively, thereof; a fuel tank disposed near said frontend of the body frame and positioned substantially upwardly of said bodyframe; a rider's seat disposed rearwardly of said fuel tank; an enginedisposed downwardly of said body frame; a receptacle adapted toselectively store large sized articles therein and disposed at leastpartially rearwardly of said fuel tank, at least partially forwardly ofsaid rider's seat, and at least partially upwardly of said engine; saidreceptacle having an opening defined therein and comprising a storagebox for storing a crash helmet therein; said seat being movablysupported on said motorcycle for selectively covering said opening; saidreceptacle including an air cleaner case integrally formed therewith,and a partition dividing said air cleaner case from an interior space ofsaid receptacle, said air cleaner case being hermetically closed by saidpartition; and said air cleaner case being integrally formed with afront wall of said receptacle, said partition having a positioning bulgefor engaging in an opening in the crash helmet to position the crashhelmet when the crash helmet is stored in said receptacle with saidopening thereof directed forwardly.
 5. A motorcycle comprising:a bodyframe extending in a straight manner substantially along a longitudinalaxis of the motorcycle and supporting front and rear wheels on front andrear ends, respectively, thereof; a fuel tank disposed near said frontend of the body frame and positioned substantially upwardly of said bodyframe; a rider's seat disposed rearwardly of said fuel tank; an enginedisposed downwardly of said body frame; a receptacle adapted toselectively store large sized articles therein and disposed at leastpartially rearwardly of said fuel tank, at least partially forwardly ofsaid rider's seat, and at least partially upwardly of said engine; saidreceptacle having an opening defined therein and comprising a storagebox for storing a crash helmet therein; said seat being movablysupported on said motorcycle for selectively covering said opening; andsaid rider's seat having a small-sized container on a lower surfacethereof, said small-sized container projecting into an opening in thecrash helmet when the crash helmet is stored in said receptacle whilethe crash helmet is turned upside down with said opening thereofdirected upwardly and when said receptacle is closed by said rider'sseat.